Global Patent Index - EP 0661140 A1

EP 0661140 A1 19950705 - Fastener driving tool.

Title (en)

Fastener driving tool.

Title (de)

Eintreibewerkzeug für Befestigungsmittel.

Title (fr)

Outil d'enfoncement d'attaches.

Publication

EP 0661140 A1 19950705 (EN)

Application

EP 94308707 A 19941125

Priority

JP 30424793 A 19931203

Abstract (en)

A fastener driving tool (1) prevents the tool from twice striking, so-called double-driving in a single driving operation. A portion (flange (23) of the nose (10)) closing the lower end of a cylinder (4) of the tool is formed with an annular recess (24) to receive a ring bumper (16) as a shock absorber of a piston (5). The recess (24) has a sufficient depth to move a lower portion of the bumper (16) downward and upward. The bumper is fittingly pressed into the recess to form an air chamber (26) in the recess (24) closed by the lower end of the bumper (16). A check valve (29) is positioned between the air chamber (26) and a supply (a return-air-chamber 11 or in the housing) of the pressurized air to feed the pressurized air to the air chamber (26) so that the pressurized air is further compressed by the bumper which is downwardly moved by the abrupt downward movement of the piston (5). Thus, greater reaction force is applied from the air chamber to the lower portion of the bumper so as to prevent a driver of the tool from the double-driving. <IMAGE>

IPC 1-7

B25C 1/04

IPC 8 full level

B25C 1/04 (2006.01); B25C 7/00 (2006.01)

CPC (source: EP US)

B25C 1/041 (2013.01 - EP US); B25C 1/047 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

DE FR GB IT SE

DOCDB simple family (publication)

EP 0661140 A1 19950705; EP 0661140 B1 19980204; DE 69408435 D1 19980312; DE 69408435 T2 19980520; JP H07156078 A 19950620; US 5441192 A 19950815

DOCDB simple family (application)

EP 94308707 A 19941125; DE 69408435 T 19941125; JP 30424793 A 19931203; US 35282994 A 19941202